Compensation Pattern for Parasitic Capacitance in Display Touch Link Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In touch-sensitive display devices, parasitic capacitance between signal lines and touch lines degrades touch sensing performance due to signal line and touch line overlap differences.
Innovation Solution
A display device with a compensation pattern is implemented in the non-display area to set appropriate compensation capacitance based on the overlap between signal link lines and touch link lines, improving touch sensing performance by reducing interference and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signal lines and touch lines are disposed in the display panel, then display function and touch sensing function are provided, but parasitic capacitance is generated between signal lines and touch lines degrading touch sensing performance
Solution Approach 1:
The patent extracts the harmful overlap region between signal link lines and touch link lines by configuring the touch link lines to bypass the overlapping area of signal link lines in the non-display area, thereby removing the source of parasitic capacitance generation while maintaining electrical connectivity functions
Solution Approach 2:
The patent introduces compensation patterns as intermediary elements that generate compensation capacitance to counterbalance the parasitic capacitance effect. These compensation patterns act as mediators between the signal link lines and touch link lines, providing a corrective capacitive effect that offsets the harmful parasitic capacitance
2Ease of operation
If touch link lines overlap with signal link lines to connect pad portion to touch lines, then electrical connection is achieved, but capacitance deviation occurs due to overlap difference
Solution Approach 1:
The patent applies different routing strategies to different segments of touch link lines based on their local conditions. In regions where signal link lines are present, touch link lines are configured to bypass overlapping areas, while in other regions normal routing is maintained, creating locally optimized capacitance characteristics throughout the display panel
Solution Approach 2:
The patent changes the geometric parameters of touch link lines by modifying their routing paths to bypass signal link line overlapping regions. This parameter change in the physical layout directly controls the overlap area, thereby controlling the parasitic capacitance value and achieving uniform capacitance characteristics across different touch link lines
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compensation pattern effectively compensates for parasitic capacitance deviations caused by overlap differences, enhancing touch sensing accuracy and reliability.
Implementation Method 1
a parasitic capacitance may be generated between a signal line for the display driving and a touch line for the touch sensing
Data Source
AI summary
Disclosed is a display device comprising a substrate including a display area and a non-display area surrounding the display area, a plurality of signal link lines disposed in the non-display area of the substrate and configured to connect a plurality of signal lines of the display area to a pad portion configured to receive an external signal, a plurality of touch link lines disposed in the non-display area, overlapped with at least some of the plurality of signal link lines and configured to connect the pad portion to a plurality of touch lines in the display area, and a compensation pattern based on an overlap between at least one of the plurality of signal link lines and at least one of the plurality of touch link line corresponding to at least one of the plurality of touch lines.